Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1a84f7f4b0918e…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 15:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1b00dd01cd1f8c63ff2dd97fdb4d320a SHA-1: 8ecba80a02e79c8c1bf7a0c7d0e5edc10dd291e7 SHA-256: fb1a84f7f4b0918e8a7aff76652c2b4b0c512e90bd4589268d59c54ce7279e8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/3da9c94843f9803c4bd4511504788e7c/30549756475.pdf In PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/xofoz.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/17663646003.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/gobivupevanafarebupep.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/takapopuvujuvekas.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16100cb8f7aa88---pirovulizapo.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38320bb8d5---20262596636.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/lerumurovalixoriwu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ce074a7a---relir.pdfIn PDF document text
    • http://elskenecologie.nl/files/67048069808.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32394367ee---wezawitadosupofup.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/tugifudajipes.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/75232704204.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/32312900273.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f3150621f0463210d87da84f5127956d/13733775772.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098367d83028---mimuperiwegifov.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/8mbg6qk3sqf0mqqjmmcj5uucb7/47910436954.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/44103881762.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/21736559599.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/6864929030.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858bd60955b---wodofanotatasipumurexika.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/kojigoxarejakawet.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955edf61f39---xatevaxalizora.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090708d94ccb---kiwiwekerekexixuzewod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=c%2B%2B+online+test+questions+and+answers+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 19960 bytes
SHA-256: f686b710663282c40b365fe5f7f33bf25d5bef8aa7ad7d9ed14862988126f928
font_01_sfnt_off000113d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEA 10856 bytes
SHA-256: e0299a8125a683d1bcafa62acd13bbd32c6be3fe3bc5681412c465f043796679